Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating Revenues:
Utility revenues, exclusive of alternative revenue programs	$ 393,820	$ 393,241
Alternative revenue programs	(4,413)	(4,658)
Total utility revenues	389,407	388,583
Non-utility revenues	823	7,898
Total operating revenues	390,230	396,481
Utility operating expenses:
Resource costs	129,547	137,347
Other operating expenses	94,496	83,978
Merger transaction costs	0	19,664
Depreciation and amortization	51,421	48,914
Taxes other than income taxes	30,978	31,943
Other non-utility operating expenses:
Other operating expenses	1,360	7,355
Depreciation and amortization	235	209
Total operating expenses	308,037	329,410
Income from operations	82,193	67,071
Interest expense	26,347	25,651
Interest Expense, Other	270	357
Capitalized interest	(998)	(928)
Merger termination fee	0	(103,000)
Other income-net	(382)	(907)
Income before income taxes	56,956	145,898
Income tax expense	8,532	30,017
Net income	48,424	115,881
Net income attributable to noncontrolling interests	0	(87)
Net income attributable to Avista Corporation shareholders	$ 48,424	$ 115,794
Weighted-average common shares outstanding (thousands), basic	67,239	65,733
Weighted-average common shares outstanding (thousands), diluted	67,381	65,941
Earnings per common share attributable to Avista Corporation shareholders:
Basic	$ 0.72	$ 1.76
Diluted	$ 0.72	$ 1.76